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Finding the Fourth Proportional to 717.79, 990.37 and 423

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Solution

The fourth proportional to 717.79, 990.37 and 423 is: 583.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    717.79 : 990.37 = 423 : x
  2. Step 2: Convert to fraction form
    717.79/990.37 = 423/x
  3. Step 3: Cross multiply
    717.79x = 990.37 × 423
  4. Step 4: Simplify right side
    717.79x = 418,926.51
  5. Step 5: Solve for x
    x = 418,926.51/717.79
  6. Step 6: Final answer
    x = 583.63

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.